128815512 has 48 divisors (see below), whose sum is σ = 374619960. Its totient is φ = 36804096.

The previous prime is 128815507. The next prime is 128815523. The reversal of 128815512 is 215518821.

It is a super-2 number, since 2×128815512² = 33186872263644288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53593 + ... + 55944.

Almost surely, 2^128815512 is an apocalyptic number.

128815512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128815512 is an abundant number, since it is smaller than the sum of its proper divisors (245804448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128815512 is a wasteful number, since it uses less digits than its factorization.

128815512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109560 (or 109549 counting only the distinct ones).

The product of its digits is 6400, while the sum is 33.

The square root of 128815512 is about 11349.6921544155. The cubic root of 128815512 is about 505.0364473907.

The spelling of 128815512 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, five hundred twelve".